FACULTY OF AGRICULTURE
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Item Performance and carcass characteristics of broiler finishers fed diets supplemented with roxazyme G and exogenous phytase(2011) Abu, O. A.; Sodeinde, A. O.; Ehaludu, J. O.; Olomola, O. O.; Babayemi, O. J.A 21-day feeding trial involving 480, 4-week old unsexed Abhor Acre broilers was carried out in a completely randomised design to evaluate performance, carcass characteristics and cost benefit of broiler finishers fed iso- caloric and iso-nitrogenous corn-soyabean based enzyme supplemented diets. Diet 1 had no supplemented Roxazyme G and phytase (T1-basal diet). The other three diets are: T2-Roxazyme G (0.2g/kg), T3-basal diet +Phytase (lg/kg) and T4-basal diet +Roxazyme G and Phytase (0.2g/kg and lg/kg) inclusion. The objective was to observe whether addition exogenous enzymes individually or as a mixture improved efficiency of broiler finisher production. The results showed no significant differences (p>0.05) across the dietary treatments for daily feed intake, weight gain and FCR. The values obtained were in the range of 137.9g, 1191.9g and 1.45 respectively. There were no significant difference (p>0.05) in carcass weight of birds on T4, T2 and TI but birds fed both Roxazyme G and phytase had heaviest carcass weight of 1533.3g . However, birds fed diets supplemented with phytase alone had significantly lower carcass weight and dressing yield to other dietary treatments. The cut up parts were not significantly different (p>0.05) except the weights of the head, drumstick and breast meat. The cost analysis showed that it is not profitable to include the enzymes in the practical broiler finishers' diet used in this study. There was no need to include the above enzymes in the diet of broilers at finishing phase as the birds at this stage can efficiently utilize nutrients in their feed.Item Performance of broiler chickens fed diets supplemented with feed grade enzyme(2009-07) Abu, O. A.; Igwebuike, J. U.; Abu, J. Z.The effect of dietary supplementation of a commercial multi-enzyme complex (Avizyme 1500™) on the performance and nutrient digestibility by broiler finishers was investigated. A total of 120 d-old broiler chickens was assigned to four treatments each having two replicates of 15 birds in a 2 x 2 factorial block design. Avizyme was-incorporated into the finisher diets at inclusion levels of 0 (high and low fibre diets), 1.0 and 2.0g/Kg diets in diets 1-4 respectively. The study covered the finisher phase (4-8 week period). Results obtained indicated that incorporation of Avizyme up to 2.0g/Kg diet into broiler finisher diet produced no significant (P > 0.05) effects on average daily feed intake and feed conversion efficiency of the birds but depressed daily weight gain (P < 0.05). The average final body weight followed the same trend as the daily weight gain, as the birds fed control diet and diet containing 1g/kg Avizyme did best (P < 0.05). The digestibility of nutrients did not differ significantly (P > 0.05) among treatments. Birds on the control diet used nutrients better than the rest treatments. The haematological parameters such as Packed Cell Volume (PCV), Haemoglobin (Hb), White Blood Cell (WBC), Mean Corpuscular Haemoglobin (MCH), and Mean Corpuscular Haemoglobin Concentration (MCHC) except for Red Blood Corpuscles (RBC) did not differ (P > 0.05) among treatments. Dressing percentage, cut-up parts and weight of organs expressed as a percentage of body weight did not differ significantly (P > .0.05). The results of this study showed that the inclusion of 1 g/kg of the enzyme mixture into broiler finisher diet did not show any adverse effect on the performance and blood parameters of the broiler chickens. The 1 g/kg level of inclusion of enzyme in the diet appears to be most beneficial to the farmer in view of its relatively better results.